Numerical relay for use with traditional pilot wires one bay, one relay concept

• In-rush restraint, lock-out
  
• Clean potential within relay panel
  
• Modern PCM-inter-trip facilities
  
• Full self-monitoring facilities
  
• Local and remote interrogation
  
• Attractive price

The 7SD610 relay is a differential protection device suitable for all types of applications and incorporating all those functions required for differential protection of lines, cables, transformers and busbars. Transformers and compensation coils within the differential protection zone are protected by means of integrated functions, which were previously to be found only in transformer differential protection. It is also well suited for complex applications such as series and parallel compensation of lines and cables. It is designed to provide protection for all voltage levels and types of networks; two line ends may lie within the protection zone. The relay features very high-speed and phase-selective short-circuit measurement. The unit is thus suitable for single-phase and three-phase fault clearance. Data communication for differential current measurement is effected via fibre-optic cables or digital communication and telephone networks, so that the line ends can be quite far apart. Its special product characteristics make it particularly suitable for use in conjunction with digital communication networks. The units measure the delay time in the communication network and adaptively match their measurements accordingly. The units can be operated through leased lines employing twisted telephone pairs up to a max. distance of 8 km by means of special converters and also through leased digital telephone lines (64/128 Kbit).

The 7SD502 line differential protection is a fast and selective differential protection unit for cables and overhead lines. It is the successor of the 7SD22 and 7SD76 static differential protection. Combination with 7SD76 or 7SD22 is not possible, i.e. 7SD502s must be used at both ends of the line. The connection between 7SD502s is made via a balanced pair of pilot wires, i.e. existing pilot wire connections can be used.

Note : Successive product = 7SD610.

The 7SD503 line differential protection is a fast and selective differential protection unit for cables and overhead lines. It is the successor of the 7SD74 static differential protection and works with it if external pilot-wire monitoring is used. The connection between two 7SD503 units is made via three pilot wires, i.e. existing pilot wire connections can be used.

Note : Successive product = 7SD610.

The 7SD511 current comparison protection units are for fast and selective short-circuit protection of cables and overhead lines of all voltage levels. The combination of dynamic and steady state measurement makes the current comparison protection sensitive to internal high resistant faults and extremely stable during short-circuit through currents. Neither the treatment of the network neutrals nor the load current has an influence on the short-circuit sensitivity. The digital transmission of protection data normally occurs via fibre optics. The integrated optical interfaces facilitate a direct connection up to 15 km. In addition an isolated V.24 interface (RS 232C) permits the connection to a powerful optoamplifier or a PCM transmission unit. The protection also includes an integrated thermal replica for monitoring the current induced heat losses and the data transmission and an emergency overcurrent protection. The devices can interface with conventional switchgear systems or alternatively be integrated in the modern substation control system SINAUT LSA.

Note : Successive product = 7SD52 or 7SD610.

The 7SD512 current comparison protection units are for fast and selective short-circuit protection of cables and overhead lines of all voltage levels. The combination of dynamic and steady state measurement makes the current comparison protection sensitive to internal high resistant faults and extremely stable during short-circuit through currents. Neither the treatment of the network neutrals or the load current has an influence on the short-circuit sensitivity. The digital transmission of protection data normally occurs via fibre optics. The integrated optical interfaces facilitate a direct connection up to 15 km. In addition an isolated V.24 interface (RS 232C) permits the connection to a powerful optoamplifier or a PCM transmission unit. The protection also includes an integrated thermal replica for monitoring the current-induced heat losses and the data transmission and an emergency overcurrent protection. The 7SD512 has an automatic -reclosure function. The devices can interface with conventional switchgear systems or alternatively be integrated in the modern substation control system SINAUT LSA.

Note : Successive product = 7SD52 or 7SD610.

The 7SS5 numerical station protection is a selective, secure and fast protection for busbar short circuits and breaker failure in medium, high and extra-high-voltage substations with various possible busbar configurations. The protection is suitable for all switchgear types with iron core or linearized current transformers. The short tripping time is especially advantageous for applications with high short circuits levels or where fast fault clearance is required for power system stability reasons. The modular hardware construction allows an optimal matching of the protection to the busbar configuration.

The 7SS52 distributed busbar/circuit breaker failure protection is a selective, secure and fast protection for busbar faults and breaker failure in medium, high and extra-high- voltage substations with various possible busbar configurations. The protection is suitable for all switchgear types with iron core or linearized current transformers. The short tripping time is especially advantageous for applications with high fault levels or where fast fault clearance is required for power system stability consideration.

The 7SS60 system is an inexpensive numerical differential current protection for busbars in a centralized configuration. It is suitable for all voltage levels and can be adapted to a large variety of busbar configurations. The components are designed for single busbar, double busbar and for 1½ breaker configuration. The use of matching transformers allows phase-selective measurement. Single-phase measurement can be achieved by using summation current transformers. The 7SS60 is designed to be the successor of the 7SS1 static busbar protection.

The 7UT512/7UT513 differential protection relays are used for fast and selective isolation of short-circuits in transformers of all voltage levels and also in rotating electric machines and short lines. The particular application can be chosen by setting. In this way an optimal adaptation of the relay to the protected object can be achieved. The protection relay can be parameterized for use with three-phase and single-phase transformers. In addition to this, a thermal replica is integrated for the supervision of the ohmic losses in the plant.

The 7UT612 differential protection relay is used for fast and selective switching off of short-circuits in two winding transformers of all voltage levels and also in rotating electric machines like motors and generators, for short two terminal lines and busbars up to 7 feeders. The particular application can be chosen by setting. In this way an optimal adaptation of the relay to the protected object can be achieved. Beside the differential function a backup overcurrent protection for 1 winding / starpoint is integrated. Optionally a low- or high impedance restricted earth fault protection, a negative sequence protection and a breaker failure can be used . With an external temperature measuring box max. 12 temperatures can be measured and supervised in the relay. A complete thermal supervision of a transformer is possible. The protection relay can be parameterized for use with three-phase and single-phase transformers. In addition to this, a thermal replica is integrated for the supervision of the ohmic losses in the plant.

The 7VH60 relay is designed for fast and selective differential protection based on the high impedance circulating current principle. It is used for the protection of machine stator windings, busbars and transformer and reactor windings against phase to phase and phase to earth short circuits. As an option the relay includes a bus-wire supervision and the differential function can be blocked by a binary input

The 7VH80 relay is designed for fast and selective differential protection based on the high impedance circulating current principle. It is used for the protection of machine stator windings, busbars and transformer and reactor windings against phase to phase and phase to earth short circuits.

Note : Successive product = 7VH60

The 7VH83 relay is designed for fast and selective differential protection based on the high impedance circulating current principle. It is used for the protection of machine stator windings, busbars and transformer and reactor windings against phase to phase and phase to earth short circuits.